i try to display a received byte[] as an Bitmap.
InputStream stream = mySocket.getInputStream();
byte[] datas = new byte[SIZE?];
Bitmap bmp = BitmapFactory.decodeByteArray(datas, 0, datas.length);
ImageView view = new ImageView(MyServer.this);
view.setImageBitmap(bmp);
lChat.addView(view);
I don't know how big the byte Array should be and i don't know how to get the data of the inputStream in the byte[]. Can anyone help me?
Create ByteArrayOutputStream
- it's an output stream in which the data is written into a byte array. Then use copy()
method (taken from the Commons IO ) to copy input stream to the output stream:
InputStream stream = mySocket.getInputStream();
ByteArrayOutputStream output = new ByteArrayOutputStream();
copy(stream, output);
byte[] data = output.toByteArray();
Bitmap bmp = BitmapFactory.decodeByteArray(data, 0, data.length);
...
Length of the data
array will be the same as length of the data read from the input stream.
Please find copy()
method below:
public static int copy(InputStream input, OutputStream output) throws IOException {
int n, count = 0;
byte[] buffer = new byte[4 * 1024];
while (-1 != (n = input.read(buffer))) {
output.write(buffer, 0, n);
count += n;
}
return count;
}
Use inputStreamToByteArray
method to parse InputStream
to byte[]
:
public byte[] inputStreamToByteArray(InputStream inputStream) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len;
while ((len = inputStream.read(buffer)) > -1) {
baos.write(buffer, 0, len);
}
baos.flush();
return baos.toByteArray();
}
Also while loading large bitmaps consider Google's suggestion. Resize them for your needs. By doing this you'll prevent many memory failures:
private Bitmap getBitmap(InputStream is, int requestedMaxWidth, int requestedMaxHeight) throws IOException {
// parse inputStream to byte[]
byte[] dataToBeDecode = inputStreamToByteArray(is);
BitmapFactory.Options options = new BitmapFactory.Options();
// First see the width and height of incoming bitmap
options.inJustDecodeBounds = true;
BitmapFactory.decodeByteArray(dataToBeDecode, 0, dataToBeDecode.length, options);
// Calculate inSampleSize for resizing
options.inSampleSize = calculateInSampleSize(options, requestedMaxWidth, requestedMaxHeight);
// Now resize and get the bitmap
options.inJustDecodeBounds = false;
Bitmap bitmap = BitmapFactory.decodeByteArray(dataToBeDecode, 0, dataToBeDecode.length, options);
return bitmap;
}
public int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int halfHeight = height / 2;
final int halfWidth = width / 2;
// Calculate the largest inSampleSize value that is a power of 2
// and keeps both
// height and width larger than the requested height and width.
while ((halfHeight / inSampleSize) > reqHeight && (halfWidth / inSampleSize) > reqWidth) {
inSampleSize *= 2;
}
}
return inSampleSize;
}
Edit: Read Google's loading large bitmaps doc. See link .
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